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ZURICH -- For years, Swiss scientists have blithely created genetically modified rice, corn and apples. But did they ever stop to consider just how humiliating such experiments may be to plants?

That's a question they must now ask. Last spring, this small Alpine nation began mandating that geneticists conduct their research without trampling on a plant's dignity.

Unfortunately, we have to take it seriously," Beat Keller, a molecular biologist at the University of Zurich. "It's one more constraint on doing genetic research."

Dr. Keller recently sought government permission to do a field trial of genetically modified wheat that has been bred to resist a fungus. He first had to debate the finer points of plant dignity with university ethicists. Then, in a written application to the government, he tried to explain why the planned trial wouldn't "disturb the vital functions or lifestyle" of the plants. He eventually got the green light.

The rule, based on a constitutional amendment, came into being after the Swiss Parliament asked a panel of philosophers, lawyers, geneticists and theologians to establish the meaning of flora's dignity.